I tried your DLL and encountered no problems whatsoever.
Just two findings which do not diminish your work:
1. when you sort a column the listbox jumps to the leftmost column
2. any means of changing the color of each (odd) second row?
As I attempt to load your source in #develop I am told to check the
path in the import declaration. My .NET version is correct (2.0.50727.42)
Where would I look for the import path? Never before used #develop.
I think not every user can remember all additional dll's with all available features.
So could you add a small help file to your distribution with a list of all provided functions (and parameters)? Or even better a .chm file so this help is accessible by the IDE?